If you are talking about the hydradrill, they have been selling those for decades. I just frankly don't believe the smaller ones will do the job in rock, and I have read that they are good to about 100 feet. The larger, more expensive ones might. Another drawback to the more inexpensive smaller ones is that they will only accomodate a 2" casing. You have to buy up to a bigger one to get a casing large enough for a submersible pump.
The average well casing in my area is 6" PVC casing pipe. I had a 70-foot well drilled, cased, capped and registered on my place 2 years ago for a total charge of $1,740. So even the argument of it being cheaper does not apply where I live. I'd check local prices on well drilling before I accepted the Web site's $8,000 figure.
When those boys hit the gravelly rock we have at about 30 feet, that truck drill had to WORK!
Now, if you are in the right places in the Midwest, you don't need any of that. All you need is a sandpoint, some iron pipe, and a tractor with front end loader to get you up to 100 feet in the ground. I've seen people drive shallow sandpoints in the right kind of soil with a ladder and a post driver. But most folks don't have that luxury.